I don't know if this will help or just further muddy the situation, but the LOC has a 1939 78-rpm Frank Luther recording called "Songs of old New York: 1650-1906" which contains "In the bright Mohawk Valley" (LC Control No.: 00727956). They have another 1982 33.1/3-rpm Robin Schade recording called "I love New York-- and I sing about it!" which contains "Bright Mohawk valley" (LC Control No.: 94758554). I got to these searching on "bright mohawk valley" at http://www.loc.gov/search/new/